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Setting value to named field in Julia – setfield() Method

  • Last Updated : 24 Feb, 2021
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The setfield() is an inbuilt function in julia which is used to assign a value x to a named field in value of composite type. The value must be mutable and x must be a subtype of fieldtype(typeof(value), name)
 

Syntax: 

setfield(value, name::Symbol, x)

Parameters: 

  • value: Specified value of composite type.
  • name::Symbol: Specified symbol.
  • x: Specified value.

Returns: It returns the assigned value x to a named field in value of composite type. 
 
Example 1: 

Python






# Julia program to illustrate
# the use of setfield() method
  
# Getting the assigned value 'x' to
# a named field in value of composite type.
mutable struct MyMutableStruct
           field::Int
       end
 
a = MyMutableStruct(1);
setfield (a, :field, 123);
println(getfield(a, :field))

Output: 
 

123

Example 2: 

Python




# Julia program to illustrate
# the use of setfield() method
  
# Getting the assigned value 'x' to
# a named field in value of composite type.
a = 5//3
println(setfield (a, :num, 123))

Output: 
 

ERROR: LoadError: type Rational is immutable
while loading /home/cg/root/5090533/main.jl, in expression starting on line 7

 

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